Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
  • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
  • B02C7/00—Crushing or disintegrating by disc mills
  • B02C7/11—Details
  • B02C7/12—Shape or construction of discs
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
  • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
  • B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
  • B02C23/08—Separating or sorting of material, associated with crushing or disintegrating
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
  • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
  • B02C7/00—Crushing or disintegrating by disc mills
  • B02C7/11—Details
  • B02C7/14—Adjusting, applying pressure to, or controlling distance between, discs
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
  • B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
  • B03B9/00—General arrangement of separating plant, e.g. flow sheets
  • B03B9/06—General arrangement of separating plant, e.g. flow sheets specially adapted for refuse
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
  • B29B17/00—Recovery of plastics or other constituents of waste material containing plastics
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
  • B29B17/00—Recovery of plastics or other constituents of waste material containing plastics
  • B29B17/0026—Recovery of plastics or other constituents of waste material containing plastics by agglomeration or compacting
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
  • B29B17/00—Recovery of plastics or other constituents of waste material containing plastics
  • B29B17/02—Separating plastics from other materials
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
  • B29B17/00—Recovery of plastics or other constituents of waste material containing plastics
  • B29B17/04—Disintegrating plastics, e.g. by milling
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
  • B29B17/00—Recovery of plastics or other constituents of waste material containing plastics
  • B29B17/02—Separating plastics from other materials
  • B29B2017/0203—Separating plastics from plastics
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
  • B29B17/00—Recovery of plastics or other constituents of waste material containing plastics
  • B29B17/02—Separating plastics from other materials
  • B29B2017/0213—Specific separating techniques
  • B29B2017/0217—Mechanical separating techniques; devices therefor
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
  • B29B17/00—Recovery of plastics or other constituents of waste material containing plastics
  • B29B17/02—Separating plastics from other materials
  • B29B2017/0213—Specific separating techniques
  • B29B2017/0217—Mechanical separating techniques; devices therefor
  • B29B2017/0231—Centrifugating, cyclones
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
  • B29B17/00—Recovery of plastics or other constituents of waste material containing plastics
  • B29B17/02—Separating plastics from other materials
  • B29B2017/0213—Specific separating techniques
  • B29B2017/0217—Mechanical separating techniques; devices therefor
  • B29B2017/0237—Mechanical separating techniques; devices therefor using density difference
  • B29B2017/0241—Mechanical separating techniques; devices therefor using density difference in gas, e.g. air flow
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
  • B29B17/00—Recovery of plastics or other constituents of waste material containing plastics
  • B29B17/02—Separating plastics from other materials
  • B29B2017/0213—Specific separating techniques
  • B29B2017/0217—Mechanical separating techniques; devices therefor
  • B29B2017/0237—Mechanical separating techniques; devices therefor using density difference
  • B29B2017/0244—Mechanical separating techniques; devices therefor using density difference in liquids
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
  • B29B17/00—Recovery of plastics or other constituents of waste material containing plastics
  • B29B17/02—Separating plastics from other materials
  • B29B2017/0213—Specific separating techniques
  • B29B2017/0217—Mechanical separating techniques; devices therefor
  • B29B2017/0251—Hydropulping for converting the material under the influence of water into a slurry, e.g. for separating laminated plastic from paper
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
  • B29B17/00—Recovery of plastics or other constituents of waste material containing plastics
  • B29B17/02—Separating plastics from other materials
  • B29B2017/0213—Specific separating techniques
  • B29B2017/0286—Cleaning means used for separation
  • B29B2017/0289—Washing the materials in liquids
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
  • B29B17/00—Recovery of plastics or other constituents of waste material containing plastics
  • B29B17/04—Disintegrating plastics, e.g. by milling
  • B29B2017/0424—Specific disintegrating techniques; devices therefor
  • B29B2017/0448—Cutting discs
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
  • B29B17/00—Recovery of plastics or other constituents of waste material containing plastics
  • B29B17/04—Disintegrating plastics, e.g. by milling
  • B29B2017/0424—Specific disintegrating techniques; devices therefor
  • B29B2017/0484—Grinding tools, roller mills or disc mills
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
  • B29K2711/00—Use of natural products or their composites, not provided for in groups B29K2601/00 - B29K2709/00, for preformed parts, e.g. for inserts
  • B29K2711/12—Paper, e.g. cardboard
  • B29K2711/123—Coated
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
  • B29L2007/00—Flat articles, e.g. films or sheets
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
  • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
  • Y02W30/00—Technologies for solid waste management
  • Y02W30/50—Reuse, recycling or recovery technologies
  • Y02W30/52—Mechanical processing of waste for the recovery of materials, e.g. crushing, shredding, separation or disassembly
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
  • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
  • Y02W30/00—Technologies for solid waste management
  • Y02W30/50—Reuse, recycling or recovery technologies
  • Y02W30/62—Plastics recycling; Rubber recycling

Definitions

• the invention relates to a process for the recycling of all types of waste plastics, in particular mixed plastics (MBS) according to claim 1.
• MFS mixed plastics
• Waste plastic naturally contains a not inconsiderable proportion of pulp, which is useless for many applications. This pulp has its origin in adhesive labels, composite packaging or incomplete separations of free paper. For plastics from waste paper collections, large quantities of pulp often adhere to the plastics. During compaction, the pulp is melted or encapsulated and thus enters the grinding process.
• Kompaktat a distinction must be made between agglomerate, which originates from a disk, ring matrix or pot agglomerator, and pellets, which are produced by Siebmatrizen compiler. Both methods compact or agglomerate the material in a dry process and produce a three-dimensional composite of plastic particles in a defined particle size.
• Siebmatrizenpellets are, however, unsatisfactory alsmahlbar with the method described in WO 2006/100044, as it easily comes to the triggering of individual film flakes, which are known not completely or not at all comminuted in the method described there. Only when the three-dimensional deformation of individual film flakes in the Siebmatrizenpellets is sufficiently strong, it comes to a satisfactory grinding result. In the case of agglomerate that has been melted or melted, WO 2006/100044 always produces an excellent grinding result, although two-dimensional flakes which are not incorporated in the agglomerate but are not melted are nevertheless not optimally comminuted.
• Pulp in the milled plastic also has the disadvantage that it hygroscopic moisture attracts and this may last longer during a drying process than in the plastic material.
• the invention has for its object to provide a method for the recycling of waste plastic, in particular mixed plastic, with which the reuse possibility of recycled waste plastics improved and in particular the separation of adhesions and / or pulp from the waste plastic is facilitated.
• the grinding of the agglomerate / compactate takes place, in at least one refining stage, which contains a so-called toothed disk refiner.
• the discs are provided with intermeshing teeth which are spaced apart on concentric circles.
• the gap width between the teeth of a circle is greater than the respectively previously ground grain. Since the grinding of the agglomerate / Kompaktats done from the inside out and a more or less continuous comminution takes place from the inside to the outside, the grain is naturally radially outwardly significantly lower than in the region of the filling opening in the axis of the refiner.
• the distance of the teeth on the circles and the distance of the grinding discs can be smaller from the inside out.
• said distance is very important because, in spite of the presence of water, there is otherwise a risk that The lumpy non-melted material between the teeth of the refiner sets and this clogged in a short time.
• Pulley refiners are known per se. They are used to disperse pulp, as is the case in the processing of waste paper.
• the pulp is placed in a suspension in the toothed disc refiner, wherein the material is first processed in a so-called walking zone in the inlet region before it flows to the rows of teeth.
• To refine material in particular Kompaktat or agglomerate Zahninchnrefiner have not been used. Toothed disc refiners are to singulate paper fibers in their previous application and not grind. The fibers should be damaged as little as possible during dispersion.
• the milling of the agglomerate / compactate with the aid of a toothed disc refiner has several advantages. Thus, it is possible to obtain a relatively homogeneous grain mixture, which later easier process, in particular can be refined. Another advantage of using a Zahnommenrefiners is that a very fine Tromahlung is possible, even with relatively tough plastics, which means that you can easily separate pulp and plastic from each other in a later step.
• Refiner wheels according to WO 2006/100044 are prone to severe signs of wear on the areas in which the barriers are arranged in the channel between the webs, since there the millbase concentrated the refining zone is fed and there are thus points of a very high Mahlintenstician.
• the grinding intensity of a toothed disc can be set much better than in the case of the refiner disc described in WO 2006/100044, which leads to a considerable improvement in the grinding result and to a reduction in the wear on the grinding discs.
• the grinding intensity and thus the degree of fine grinding can be adjusted with a Zahnommenrefiner on the number of rows of teeth, as well as the spacing of the tooth circles with each other, so that the toothed wheel can be optimized for different materials and the areas of high Mahlintenstician are more uniform than in a slice according to WO 2006/100044.
• the one or both refining stages may contain a toothed disc refiner for grinding the agglomerate or compactate.
• the ground material from the toothed disc refiner is preferably directly mechanically dehydrated according to a further embodiment of the invention.
• the mechanical drainage can be done, for example, with the aid of a centrifuge.
• the separated water can be used to remove extremely fine particles which can not be used or used for the further process.
• a toothed disk refining stage according to the invention can also be arranged following a conventional knife disk refiner for comminuting agglomerate / compactate.
• the mechanically dewatered or dried regrind of the first disc refiner is placed in a container with water, from which it is then entered by means of a pump or a plug screw in the toothed disc refiner.
• the process water produced during mechanical dewatering can either be subjected to wastewater treatment or returned to the inlet of the toothed disc refiners.
• the pulp / plastic grain fraction is preferably collected in a sieve or filter.
• the filter or sieve fraction is after-dried in a further air dryer, for example air-layer dryer. This measure may be important in that in the first drying stage, the plastic is already dry, while the pulp, which requires a longer drying time, is still moist.
• Separation of ground plastic and pulp may also be by wet process, e.g. through screening, swimming sifting, sorting centrifuge or vacuum screening. The latter is the sucking of the pulp suspension through a sieve by means of negative pressure.
• a screening device according to US 2004/0050510 A1 can be used, but the plastic forms the accept while the pulp passes through the drum screen.
• Decisive in the process according to the invention is that by appropriate milling of the agglomerate / compactate and, for example, closing drying of the millbase by air classification during drying a separation of a plastic fraction with virtually no pulp on the one hand from a pulp / plastic fraction on the other hand is made possible.
• the water content of the filter material can be controlled via the following parameters.
• One parameter is the flow volume of the air used for drying.
• Another parameter is the location in which a controlled volume of air is introduced into or removed from the material to be ground.
• the deposition is successful at the end of the drying process, although the pulp has reached the desired dryness.
• the freeness of the material and there in particular the particle size distribution within the sieve curve is of importance.
• the separation of the pulp depends essentially on the weight of the individual grains and the air resistance.
• the fine fraction tends to be deposited together with the pulp and the coarser grain goes into the plastic fraction. This effect can be further exploited.
• Fine plastics, especially of polyolefin origin, together with pulp, provide a very usable material for the production of so-called wood-plastic composites (WPC).
• WPC wood-plastic composites
• the plastic-acid mixture is brought into granulate form via an agglomerator or it is sprinkled directly onto a double belt calender.
• Another possibility is compounding, for example, in a special extruder with a degassing device and optionally adding additives, such as for example, maleic anhydrite. It is also possible to admix virgin plastics of virgin origin, reactor products or high-quality plastics from plastic sorting in order to produce targeted processing qualities. In any case, a fiber coating of the plastics is produced for this application, so that the addition of wood chips and fibers is reducible or even dispensable. This eliminates the processing of wood chips or fibers for the production of WPC, which leads to great economic savings. The further economic effect lies in the waste disposal sector, which otherwise involves high costs for the disposal of the pulp.
• the proportion of plastic in the filter or sieve fraction can be increased if the air flow in the dryer is increased. Otherwise, an increase in the proportion of plastic in the production of a WPC compound must be done by adding ground plastic.
• a conventional toothed disk as it is known to be used for dispersing, is in principle possible in the invention. For reasons of optimization it should be modified, eg to improve the grinding intensity. He needs some modifications, as can already be deduced from the above information.
• a toothed disc refiner is used, in which the distance of the disc surfaces starting from the central feed opening decreases radially outward continuously. The distance of the discs at the feed opening is adjusted so that the material can enter between the toothed discs without faltering.
• a toothed disc refiner can be used, in which the radial outer region of the discs has radial or approximately radial ribs spaced in the direction of rotation, as they have knife disc refiners, as they have become known for grinding plastic agglomerate.
• the grinding ribs can be provided with barriers in such a way that the crushed grains are directed towards the adjacent pane.
• a toothed disc refiner can be used in which the toothed discs are formed from the central feed, starting at the circumferential distance channels extending over a certain distance to the outside.
• the channels which can decrease in depth from the inside to the outside, are in any case so wide that they allow the entry of Kompaktats.
• Fig. 1 shows a plant scheme for processing agglomerated
• FIG. 2 shows a refining stage with a toothed disc refiner according to FIG.
• FIG. 3 shows the same refining stage according to Fig. 2 following a conventional Aufmahlprozeß for plastic agglomerate.
• Fig. 4 shows a similar view as Fig. 3 with a slight modification.
• Fig. 5 shows the plan view of a disc of a Zahninnrefiners for use in the invention.
• FIG. 6 shows a modification of the toothed disk according to FIG. 5.
• FIG. 7 shows a perspective view of the toothed disk according to FIG. 6.
• Fig. 8 shows schematically the drying and air classification at the end of the
• a first refiner 10 and a second Ref ⁇ ner 12 are shown, which are each driven by a drive motor 14 and 16a.
• the refiner 10, 12 are so-called ZahnIMOnrefiner, as described in more detail below.
• plastic agglomerate or Kompaktat which has been previously made of plastic flakes and similar sorted plastic waste, which is known per se, fed to a screw conveyor 16, in which water is introduced.
• the suspension of water and plastic agglomerate or Kompaktat is entered into the toothed disc refiner 10.
• the granular regrind will be in drained of a mechanical drainage, for example by means of a centrifuge.
• Process water with fines passes into a fine screening, in which the fines are separated from the process water.
• the fines have a grain size of 0.25 mm or 0.5 mm or less.
• the process water passes to a wastewater treatment and from there back into the screw conveyor 16.
• the dewatered ground material passes into another screw conveyor 18 together with supplied process water.
• the screw conveyor 18 is optionally also supplied fresh water.
• the millbase is further ground and separated in a mechanical dewatering, such as a centrifuge, from the process water and fines.
• the process water can, after again fines have been separated, are fed to a wastewater treatment.
• the dewatered millbase passes from the exit of the stage shown in FIG. 1, as indicated at 20, to a drying stage.
• the material to be ground from the refiner 10 can also be returned directly to its inlet or screw conveyor 16, e.g. in a volume fraction of 30%.
• a recycle may be provided for each refining step, as e.g. Also shown in Figs. 2 to 4 are shown.
• plastic agglomerate or compact is introduced together with water into a container 22, the solids content being at least 10%.
• this mixture is introduced into a toothed disc refiner 26.
• the millbase is mechanically dewatered, for example by means of a centrifuge.
• the process water with fines can be returned to the container 22.
• the fines can also be sieved.
• the dehydrated ground material passes to a further processing stage 28, for example one such as has been described in detail in WO 2006/100044.
• ground material is dried in a drier 30, which is produced, for example, with a disk refiner.
• the dryer 30 can be bypassed, whereby the dewatered material to be ground the previous refining is fed directly to the container 32.
• the material is entered into the container 32 with process water what, in turn, the solids content is at least 10%.
• Via a solids pump 34 the mixture is introduced into a toothed disc refiner 36, in which a grinding takes place to even finer-grained material.
• the millbase is mechanically dehydrated and fed to a dryer 32. Process water with fines, which are optionally separated, can be fed to a wastewater treatment or back into the container 32nd
• FIG. 4 differs from that of FIG. 3 only in that no water tank 32 is used, but the good is entered together with process water in a screw conveyor 38.
• Fig. 5 the plan view is shown on a disc 40 of a Zahnommenrefiners, as it can be used for grinding of agglomerate / Kompaktat.
• a disc 40 of a Zahnommenrefiners it is that disc of a pair of toothed pulleys, over the central opening 42 of which material to be comminuted is introduced.
• teeth 44 are formed in ten circles, which are arranged centrally. Between the teeth 44, the disc 40th flat.
• the teeth which may have different shapes, each have a distance 46 on a circle, which in the case shown is approximately the same, but can decrease from the inside to the outside. Between the circles, the teeth have a distance 48. Again, this can be smaller from the inside out.
• the toothed disc 40a according to FIG. 6 differs from that according to FIG. 5 in that, starting from the feed opening 42, several channels 50 are formed.
• the channels have an approximately circular arc shape, wherein the curvature is such that the ends of the channels 50 opposite to the direction of rotation, which is indicated by the arrow 52.
• the channels 50 have a width that is slightly or slightly greater than the width of the largest agglomerate / Kompaktatteilchen that are supplied via the feed port 42. If, on the other hand, agglomerate or compactate, but already ground agglomerate / compactate, is the material to be comminuted, the width of the channels 50 is correspondingly smaller.
• the channels 50 are adjacent to the Feed opening 42 the greatest depth and gradually decrease in depth, with the end they expire in the toothed disc surface.
• a fluidized bed dryer is shown schematically, as it can be used approximately at the terminal 20 of the embodiment of FIG. 1 or for the dryer 32 of Figures 3 and 4. He is designated 60 in total.
• the elongated housing is divided longitudinally by a sieve or grid 62 which carries the grinding material 64 supplied above. Below the screen 62 warm air coming from a heater is supplied. Cold air is supplied in the last third.
• the elongated housing is suitably vibrated so that the material advances as a bed on the screen 62 from left to right.
• Such a fluidized bed dryer is known per se.
• the dried material passes 66 at the right end of the housing of the fluidized bed dryer.
• the dryer shown also serves as an air classifier.
• the regrind 64 contains granular plastic and pulp.
• the pulp is conducted along with any still adhering very fine plastic grains via the line 68 to a sieve or filter 70, where pulp and plastic are collected.
• the sieve fraction is passed through 72 for further processing, optionally after further drying via a flight dryer. Further processing takes place, for example, in the production of WPC molded parts.
• the dried pure Kunststoffmahlgut can be fed directly or after further sorting, for example, by particle sizes, the further processing.

Landscapes

• Engineering & Computer Science (AREA)
• Environmental & Geological Engineering (AREA)
• Mechanical Engineering (AREA)
• Food Science & Technology (AREA)
• Separation, Recovery Or Treatment Of Waste Materials Containing Plastics (AREA)
• Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
• Processing Of Solid Wastes (AREA)
• Crushing And Pulverization Processes (AREA)
• Adhesives Or Adhesive Processes (AREA)
• Disintegrating Or Milling (AREA)

Priority Applications (13)

Applications Claiming Priority (4)

Publications (1)

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Families Citing this family (37)

Citations (6)

Family Cites Families (11)

• 2006
  • 2006-11-17 DE DE102006054770.5A patent/DE102006054770B4/de active Active
  • 2006-11-17 DE DE200610054769 patent/DE102006054769A1/de not_active Withdrawn
• 2007
  • 2007-11-15 AT AT07846593T patent/ATE543623T1/de active
  • 2007-11-15 US US12/515,144 patent/US8388873B2/en active Active
  • 2007-11-15 PT PT07846593T patent/PT2094461E/pt unknown
  • 2007-11-15 KR KR1020097012605A patent/KR101445192B1/ko active IP Right Grant
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